Hardware key and HP Bidirectional printers

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News:

Effective 7/4/2019, Spectrum Software is closed. Micro-Cap is now free.

Technical support will be available for at least 90 days via email at Support.

You can download the latest versions of Micro-Cap here: Download
You can choose either the executable program or the entire installation CD for MC10, MC11, and MC12. If you have an earlier version, download and use MC12. These new versions do not require the security key, so they make Micro-Cap free to the entire engineering community.

Thank you for the honor and privilege of serving you for the last 39 years.

Spectrum Software

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Incompatibilities

I've been having problems printing to my HP LaserJet 5PL. However, when I take off the MC5 hardware key, I don't have a problem. Why?

There is an incompatibility between the new HP printer drivers and the Sentinel security key. These drivers use nonstandard bidirectional communication which can cause trouble to other devices that are present on the parallel port. Rainbow, the manufacturer of the security keys, provided us with some solutions for this occurrence in one of their technical notes. These notes may be found in the Summer 1996 newsletter.

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